Wipe the hard drive.
Restore all PC settings to factory settings.
Remove all user accounts and settings.
Remove all after factory installed applications.
To perform a system recovery, you can use the BIOS, the workstation’s recovery button, or the Microsoft Windows operating system recovery function.
Check My Oracle Support (https://support.oracle.com) for updated OS image before performing factory recovery. An updated image contains new Windows Security updates and any new operating system configuration settings made since last released image.